TMS320F28379D: Interrupt handling related query

Rupak Chakraborty

Hello

I am working in power electronic converters and am facing some issues. I shall first explain my requirement out of the TMS320F28379D MCU

I need to run an ISR at underflow of the Epwm timer. this isr will have the ADC sampling and some other codes. Epwm comparison is also needed. whenever the epwm comparison is matching, i need to perform a few set of instructions. there are several problems that i am facing in this entire process.

1. Epwm timer can be either configured to run at underflow, or comparison. the same epwm timer cannot be used for both functions.

2. i can always use two epwm timers for the issue but i need both of the ISRs to run simultaneously if needed.

3. once underflow interrupt is enabled, comparison ISR cannot be serviced untill the underflow ISR is over. in my case, this is not acceptable.

4. even if i am able to somehow service the comparison ISR, comparison results are directly sent to output pins. i need to process that output and compute several instructions continously based on the result of compare output.

One possible option might be to use another controller (preferably FPGA) to service the output of the compare unit.

I am looking for as many ideas as possible to implement my idea in any alternate manner possible.

Thanking you

Rupak

over 7 years ago

0 Kris Parrent over 7 years ago

Intellectual 870 points

Hi Rupak,

One option may be to use another PWM timer as the source for both interrupts. You can configure it to generate interrupts on TBCTR=0 or TBCTR=PRD so in this case you would just program the spare TBPRD to your compare value.

Regards,

Kris

0 Devin Cottier over 7 years ago in reply to Kris Parrent

TI__Guru 60865 points

Hi Rupak,

F2837xD has two C28x cores and two CLAs. If you need the two tasks to occur simultaneously with absolutely no serialization then you probably want to run them on two separate cores. Do both tasks need to update the ePWM, or do they have different output paths?

0 Devin Cottier over 7 years ago in reply to Devin Cottier

TI__Guru 60865 points

Hi Rupak,

Were you able to resolve your issue? Do you have outstanding questions for TI or the e2e community?

0 Rupak Chakraborty over 7 years ago in reply to Devin Cottier

Intellectual 380 points

I am in need of concurrent computations for all the three phases of the three phase system. hence i am using FPGA to be coupled with DSP. apart from certain calculations all will be done in dsp and specific computations will be done by FPGA. this way i am managing my requirement

0 Manish Bhardwaj over 7 years ago in reply to Rupak Chakraborty

TI__Mastermind 43730 points

Rupak,

For the ISR question can you provide a timing diagram.

What type of converter is this? Three phase grid connected inverter? or motor control?

Have you looked at some examples we have?

Are you trying to implement some new scheme for control in these applications?

0 Devin Cottier over 7 years ago in reply to Manish Bhardwaj

TI__Guru 60865 points

Hi Rupak,

Since we haven't heard from you in awhile I'm going to request the thread to be closed. If you'd like to continue the discussion feel free to reply. If the thread locks in the future, you can use the 'ask a related question' button to continue the discussion.

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TMS320F28379D: Interrupt handling related query